| 摘要 |
PROBLEM TO BE SOLVED: To save wiring by applying display control to alarming through the use of two transmission lines for establishing a speech in the connection between an entrance slave unit and a living room master unit. SOLUTION: An operation power supply, a speech voice, an alarm signal and an alarm tone from the living room master unit are multiplexed and transmitted to the entrance slave unit through the two transmission lines L1, L2 for connecting between the entrance slave unit 1 and the living room master unit 2. Further, the entrance slave unit demultiplexes the multiplexed signal comprising the operation power supply, the speech voice, the alarm signal and the alarm tone transmitted from the living room master unit to execute supply of the operation power supply, sounding of the speech voice, display control of an alarm display light 107 through the reception of the alarm signal, and sounding of the alarm tone from a slave unit speaker 105. Further, the entrance slave unit applies the display control to the alarm display light at the same time when the speech is established. COPYRIGHT: (C)2007,JPO&INPIT
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